Programming PHP

The alternate syntax is:
foreach ($array as $key => $value):
// ...
endforeach;
declare
The declare statement allows you to specify execution directives for a block of code.
The structure of a declare statement is:
declare (directive)
statement
Currently, there is only one declare form, the ticks directive. Using it, you can specify
how frequently (measured roughly in number of code statements) a tick function
registered with register_tick_function( ) is called. For example:
register_tick_function("some_function");
declare(ticks = 3) {
for($i = 0; $i < 10; $i++) {
// do something
}
}
In this code, some_function( ) is called after every third statement is executed.
exit and return
The exit statement ends execution of the script as soon as it is reached. The return
statement returns from a function or (at the top level of the program) from the script.
The exit statement takes an optional value. If this is a number, it’s the exit status of
the process. If it’s a string, the value is printed before the process terminates. The
exit( ) construct is an alias for die( ):
$handle = @mysql_connect("localhost", $USERNAME, $PASSWORD);
if (!$handle) {
die("Could not connect to database");
}
This is more commonly written as:
$handle = @mysql_connect("localhost", $USERNAME, $PASSWORD)
or die("Could not connect to database");
See Chapter 3 for more information on using the return statement in functions.
Including Code
PHP provides two constructs to load code and HTML from another module: require
and include. They both load a file as the PHP script runs, work in conditionals and
54 | Chapter 2: Language Basics
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